Islamic State Poaches International Aid for Syrians

Thefts Are Latest Weapon in Quest for Power

GAZIANTEP, Turkey—Islamic State militants have been seizing foreign aid destined for the neediest Syrians to redistribute under the extremist group’s black flag, the latest tactic in its quest for power.

Representatives of aid agencies that work in areas controlled by the militants told The Wall Street Journal they are trying to work around that problem as they confront another one: the detentions of their employees by the group, also known as ISIS or ISIL.